Control Device of Water Heater

ABSTRACT

A control device of water heater comprises a touch pattern position for selecting water temperature stall formed on water heater; a capacitive touch unit including a touch sensing circuit provided in water heater and corresponding to touch pattern position for selecting water temperature stall, being used for sensing touch action of human body and sending touch signal, a control unit connected to capacitive touch unit, touch pattern position for selecting water temperature stall sending touch signal when touch action is sensed, and control unit switching between preset five stalls. Wherein one of five stalls is a neutral stall doing, and the remaining four stalls are preset water temperature stalls. Each stall corresponds to a temperature range, and two adjacent stall have coincident range.

This application is the U.S. national phase of International Application No. PCT/CN2016/078507 Filed on 6 Apr. 2016 which designated the U.S. the entire contents of each of which are hereby incorporated by reference.

TECHNICAL FIELD

The present invention relates to a control device of water heater.

BACKGROUND

A currently popular water heater display panel displays temperature through LED digital tube on the market. Operation condition of the water heater is indicated through different colors of LED indicator, and heating temperature stalls are selected with a key switch. However, actual application does not require very precise temperature value. Control circuit is complex through the LED digital tube displaying temperature, and cost of the water heater is also increased. Heating temperature stalls have disadvantages through key switch way to select control, because working environment of the water heater is kitchen with relatively humid environment. A key switch is easy to damp and become switch failure and stall out of control after using a period time in such harsh environment. Heating temperature is not controlled and final hot water out of the water heater does comply with setting stalls. The water heater out of control also will continuously heat and lead to constant waste of energy.

DESCRIPTION

First purpose of the present invention is to solve at least above problems and to provide at least the advantages that will be described later.

Second purpose of the present invention is to provide a control device of water heater selecting stall using human body capacitive sensing touch mode to control water heater for automatic heating.

Third purpose of the present invention is to provide a control device of water heater for preventing scalding by back-flow of hot water remaining on external tap pipe to inside of the water heater before hot water flows completely, meanwhile expecting cold water immediately flowing out.

Fourth purpose of the present invention is to provide a control device of water heater capable of providing filtered hot and cold water or unfiltered hot and cold water.

The technical solution provided from the present invention is:

A control device of water heater, comprising:

A touch pattern position for selecting water temperature stall, which is formed on the water heater;

A capacitive touch unit including a touch sensing circuit provided in the water heater and corresponding to the touch pattern position for selecting water temperature stall, the capacitive touch unit being used for sensing a touch action of human body and sending a touch signal, and

A control unit electrically connected to the capacitive touch unit, the touch pattern position for selecting water temperature stall sending a touch signal when a touch action is sensed, and the control unit switching at once between preset five stalls according to a preset sequence;

Wherein one of the five stalls is a neutral stall which does not activate heating function, and the remaining four stalls are preset water temperature stalls. Each water temperature stall corresponds to a temperature range, and two adjacent water temperature stall has coincident temperature value range.

Preferably, in the above-described control device of water heater,

Heating temperature of four preset water temperature stalls being in order of 81° C. to 86° C., 85° C. to 90° C., 89° C. to 94° C. and 93° C. to 98° C.,

The preset sequence being sequentially cycled in accordance with the five stalls of 81° C. to 86° C., 85° C. to 90° C., 89° C. to 94° C., 93° C. to 98° C. and the neutral stall.

Preferably, in the control device of water heater, the touch action being provided with a preset time, when time of the touch action is not shorter than the preset time, the touch pattern position for selecting water temperature stall senses the touch action and sends a touch signal. When time of the touch action is shorter than the preset time, the touch pattern position for selecting water temperature stall can not sense the touch action.

Preferably, in the control device of water heater, the preset time is 500 ms.

Preferably, the control device of water heater also comprises:

A heat generating pipe provided in a liner of a heater of the water heater and electrically connected to the control device;

A temperature detector disposed outside of the liner of the heater to detect water temperature of the liner, the temperature detector being electrically connected to the control device;

The control device controls power supply or interruption of the heat generating pipe in accordance with water temperature detected and temperature currently-executed of water temperature stall.

Preferably, the control device of water heater also comprises:

Four stall indicator lights which are arranged at the water heater, are located beside the touch pattern position for selecting water temperature stall, and are electrically connected with the control device, each stall indicator light respectively corresponding to a water temperature stall, the four stall indicator lights corresponding to the neutral stall. When in the state of one of water temperature stall, the control device controls stall indicator light corresponding to the water temperature stall turning on. When in the neutral stall, the four stall indicator lights are turned on at the same time.

Preferably, in the control device of water heater, when in a water temperature stall, stall indicator light corresponding to the water temperature stall twinkles in heating process. The stall indicator light is permanent bright when heating reaches the highest temperature of the water temperature stall. When in the neutral stall, the four stall indicator lights are all permanent bright. The stall indicator light is LED indicator light;

Preferably, the control device of water heater also comprises:

A power supply;

A power supply indicator light provided in front of the water heater and electrically connected to the power supply and the control device.

Preferably, the control device of water heater also comprises:

A decorative ring disposed on the water heater, the decorative ring forming the touch pattern position for selecting water temperature stall.

A control device of water heater, comprising:

A touch pattern position for selecting water temperature stall, which is formed on the water heater;

A capacitive touch unit including a touch sensing circuit provided in the water heater and corresponding to the touch pattern position for selecting water temperature stall, the capacitive touch unit being used for sensing a touch action of human body and sending a touch signal;

A hot water solenoid valve provided on a hot water pipeline of the water heater;

A return solenoid valve provided on a return pipeline of the water heater, the return pipeline communicating with the hot water pipeline, the return solenoid valve being a normally open type direct acting solenoid valve;

A control unit electrically connected to the capacitive touch unit, the touch pattern position for selecting water temperature stall sending a touch signal when a touch action is sensed, and the control unit switching at once between preset five stalls according to a preset sequence;

Wherein one of the five stalls is a neutral stall which does not activate heating function, and the remaining four stalls are preset water temperature stalls. Heating temperature of four preset water temperature stalls being in order of 81° C. to 86° C., 85° C. to 90° C., 89° C. to 94° C. and 93° C. to 98° C.;

The preset sequence being sequentially cycled in accordance with the five stalls of 81° C. to 86° C., 85° C. to 90° C., 89° C. to 94° C., 93° C. to 98° C. and the neutral stall;

The control unit electrically connected to hot water solenoid valve and return solenoid valve, the control unit controlling the hot water solenoid valve to supply hot water, and then, through the return solenoid valve to make hot water of the hot water pipeline through the return pipeline back-flow to the liner of a heater of the water heater.

Preferably, the control device of water heater also comprises:

A cold water solenoid valve arranged at a cold water pipeline of the water heater, the cold water pipeline connecting in parallel with the hot water pipeline, the cold water solenoid valve also electrically connected to the control unit, when the cold water solenoid valve is opened to supply cold water, closing the return solenoid valve at the same time to prevent scalding because of cold water mixing with hot water.

Preferably, in the control device of water heater, the cold water solenoid valve and hot water solenoid valve are normally closed type direct acting solenoid valves.

Preferably, in the control device of water heater, back-flow time of the return solenoid valve is 5 s.

A control device of water heater, comprising:

A touch pattern position for selecting water temperature stall, which is formed on the water heater;

A capacitive touch unit including a touch sensing circuit provided in the water heater and corresponding to the touch pattern position for selecting water temperature stall, the capacitive touch unit being used for sensing a touch action of human body and sending a touch signal;

A filter water supply pipeline provided with a filter, a liner of a heater of the water heater arranged at downstream of the filter,

A tap water supply pipeline;

A control unit electrically connected to the capacitive touch unit, the touch pattern position for selecting water temperature stall sending a touch signal when a touch action is sensed, and the control unit switching at once between preset five stalls according to a preset sequence;

Wherein one of the five stalls is a neutral stall which does not activate heating function, and the remaining four stalls are preset water temperature stalls. Heating temperature of four preset water temperature stalls being in order of 81° C. to 86° C., 85° C. to 90° C., 89° C. to 94° C. and 93° C. to 98° C.;

The preset sequence being sequentially cycled in accordance with the five stalls of 81° C. to 86° C., 85° C. to 90° C., 89° C. to 94° C., 93° C. to 98° C. and the neutral stall.

Preferably, the control device of water heater also comprises:

A hot water solenoid valve provided on hot water pipeline of the filter water supply pipeline and tap water supply pipeline;

A return solenoid valve provided on a return pipeline of the filter water supply pipeline and tap water supply pipeline, the return solenoid valve being a normally open type direct acting solenoid valve;

The control unit also electrically connected to the hot water solenoid valve and the return solenoid valve, the control unit controlling the hot water solenoid valve to supply hot water, and then, through the return solenoid valve to make hot water of the hot water pipeline go through the return pipeline back-flow to the liner of a heater of the water heater.

Preferably, the control device of water heater also comprises:

A cold water solenoid valve arranged at a cold water pipeline of the water heater, the cold water pipeline connecting in parallel with the hot water pipeline, the cold water solenoid valve also electrically connected to the control unit, when the cold water solenoid valve is opened to supply cold water, closing the return solenoid valve at the same time to prevent scalding because of cold water mixing with hot water.

The advantages of the present invention are as follows.

Using capacitive touch mode to select heating stall, setting fifth stall selection, having stall memory function after power off; providing return valve to prevent scalding cold through back-flow hot water of pipeline of external tap to heater before hot water stopping for immediately flowing cold water, providing four pipeline water, according to need to select filtered or not filtered cold water and hot water, setting fifth neutral stall for doing not start heating function, acquiescent stopping in the fifth stall of the neutral stall after supplying power, because initial use of liner is not filled with water, at this time water action can be performed through the fifth stall of the neutral stall, when filling with water and then setting other stalls. In case of no need use of hot water, choosing the fifth stall of the neutral stall to avoid repeated heating of heating tube caused by energy waste.

Other advantages, objects, and features of the invention will be showed in part through following description, and in part will be understood by those skilled in the art from study and practice of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a overall view of the water heater of the invention;

FIG. 2 is a sectional view of the water heater of the invention;

FIG. 3 is a internal structural view of the water heater of the invention;

FIG. 4 is A board view of control circuit board of the water heater of the invention;

FIG. 5 is B board view of control circuit board of the water heater of the invention;

FIG. 6 is a water control block diagram of the water heater of the invention;

FIG. 7 is a circuit control block diagram of the water heater of the invention;

FIG. 8 is a transformer part schematic diagram of the water heater of the invention;

FIG. 9 is a rectifier filter part schematic diagram of the water heater of the invention;

FIG. 10 is a relay drive part schematic diagram of the water heater of the invention;

FIG. 11 is a connection schematic diagram of the A board and the B board of the control circuit board of the water heater of the invention;

FIG. 12 is a power voltage stabilizing part schematic diagram of the water heater of the invention;

FIG. 13 is a touch control unit part schematic diagram of the water heater of the invention;

FIG. 14 is a heating control part schematic diagram of microcontroller of the water heater of the invention;

FIG. 15 is a control part schematic diagram of microcontroller of the water heater of the invention;

FIG. 16 is a solenoid valve drive part schematic diagram of the water heater of the invention.

DETAILED DESCRIPTION

The present invention will now be described in further detail with reference to the accompanying drawings as required:

It is to be understood that terms of “having”, “containing” and “including” as used herein do not exclude presence or addition of one or more other elements or combinations thereof.

As shown in FIG. 1-16, The present invention provides a control device of water heater, comprising:

A touch pattern position for selecting water temperature stall, which is formed on the water heater 100;

A capacitive touch unit including a touch sensing circuit provided in is the water heater and corresponding to the touch pattern position for selecting water temperature stall, the capacitive touch unit being used for sensing a touch action of human body and sending a touch signal, and

A control unit electrically connected to the capacitive touch unit, the touch pattern position for selecting water temperature stall sending a touch signal when a touch action is sensed, and the control unit switching at once between preset five stalls according to a preset sequence;

Wherein one of the five stalls is a neutral stall which does not activate heating function, and the remaining four stalls are preset water temperature stalls. Each water temperature stall corresponds to a temperature range, and two adjacent water temperature stall has coincident temperature value range.

In one of embodiment of the invention, it is preferred that heating temperatures of four preset water temperature stalls are in order of 81° C. to 86° C., 85° C. to 90° C., 89° C. to 94° C. and 93° C. to 98° C.;

The preset sequence being sequentially cycled in accordance with the five stalls of 81° C. to 86° C., 85° C. to 90° C., 89° C. to 94° C., 93° C. to 98° C. and the neutral stall. The first stall is 81° C. to 86° C., the second stall is 85° C. to 90° C., the third stall is 89° C. to 94° C., the fourth stall is 93° C. to 98° C., and the fifth stall is neutral stall. The preset sequence being sequentially cycled in accordance with the is first stall of 81° C. to 86° C., the second stall of 85° C. to 90° C., the third stall of 89° C. to 94° C., the fourth stall of 93° C. to 98° C. and the fifth stall of the neutral stall, and stopping in the fifth stall of the neutral stall after supplying power.

In one of embodiment of the invention, it is preferred that the touch action is provided with a preset time. When time of the touch action is not shorter than the preset time, the touch pattern position for selecting water temperature stall senses the touch action and sends a touch signal. When time of the touch action is shorter than the preset time, the touch pattern position for selecting water temperature stall can not sense the touch action.

In one of embodiment of the invention, it is preferred that the preset time is 500 ms.

In one of embodiment of the invention, it is preferred that the control device of water heater also comprises:

A heat generating pipe 114 provided in a liner of a heater of the water heater and electrically connected to the control device;

A temperature detector disposed outside of the liner 111 of the heater to detect water temperature of the liner 111, the temperature detector being electrically connected to the control device;

The control device controls power supply or interruption of the heat generating pipe 114 in accordance with water temperature detected and temperature currently-executed of water temperature stall.

In one of embodiment of the invention, it is preferred that the control device of water heater also comprises:

Four stall indicator lights which are arranged at the water heater, are located beside the touch pattern position for selecting water temperature stall, and are electrically connected with the control device, each stall indicator light respectively corresponding to a water temperature stall, the four stall indicator lights corresponding to the neutral stall. When in the state of one of water temperature stall, the control device controls stall indicator light corresponding to the water temperature stall turning on. When in the neutral stall, the four stall indicator lights are turned on at the same time.

In one of embodiment of the invention, preferably, when in a water temperature stall, stall indicator light corresponding to the water temperature stall twinkles in heating process. The stall indicator light is permanent bright when heating reaches the highest temperature of the water temperature stall. When in the neutral stall, the four stall indicator lights are all permanent bright. The stall indicator light is LED indicator light;

In one of embodiment of the invention, it is preferred that the control device of water heater also comprises:

A power supply;

A power supply indicator light provided in front of the water heater 100 and electrically connected to the power supply and the control device.

In one of embodiment of the invention, it is preferred that the control device of water heater also comprises:

A decorative ring 106 disposed on the water heater, the decorative ring 106 forming the touch pattern position for selecting water temperature stall.

The present invention also provides a control device of water heater, comprising:

A touch pattern position for selecting water temperature stall, which is formed on the water heater 100;

A capacitive touch unit including a touch sensing circuit provided in the water heater 100 and corresponding to the touch pattern position for selecting water temperature stall, the capacitive touch unit being used for sensing a touch action of human body and sending a touch signal;

A hot water solenoid valve provided on a hot water pipeline of the water heater 100;

A return solenoid valve provided on a return pipeline of the water heater 100, the return pipeline communicating with the hot water pipeline, the return solenoid valve being a normally open type direct acting solenoid valve;

A control unit electrically connected to the capacitive touch unit, the is touch pattern position for selecting water temperature stall sending a touch signal when a touch action is sensed, and the control unit switching at once between preset five stalls according to a preset sequence;

Wherein one of the five stalls is a neutral stall which does not activate heating function, and the remaining four stalls are preset water temperature stalls. Heating temperature of four preset water temperature stalls being in order of 81° C. to 86° C., 85° C. to 90° C., 89° C. to 94° C. and 93° C. to 98° C.;

The preset sequence being sequentially cycled in accordance with the five stalls of 81° C. to 86° C., 85° C. to 90° C., 89° C. to 94° C., 93° C. to 98° C. and the neutral stall;

The control unit electrically connected to hot water solenoid valve and return solenoid valve, the control unit controlling the hot water solenoid valve to supply hot water, and then, through the return solenoid valve (normally open type) to make hot water of the hot water pipeline through the return pipeline flow back to the liner 111 of a heater of the water heater 100.

In one of embodiment of the invention, it is preferred that the control device of water heater also comprises:

A cold water solenoid valve arranged at a cold water pipeline of the water heater 100, the cold water pipeline connecting in parallel with the hot water pipeline, the cold water solenoid valve also electrically connected to the is control unit, when the cold water solenoid valve is opened to supply cold water, closing the return solenoid valve at the same time to prevent scalding because of cold water mixing with hot water.

In one of embodiment of the invention, it is preferred that the cold water solenoid valve and hot water solenoid valve are normally closed type direct acting solenoid valves, and the return solenoid valve is normally open type direct acting solenoid valve.

In one of embodiment of the invention, it is preferred that back-flow time of the return solenoid valve is 5 s.

The present invention also provides a control device of water heater, comprising:

A touch pattern position for selecting water temperature stall, which is formed on the water heater 100;

A capacitive touch unit including a touch sensing circuit provided in the water heater and corresponding to the touch pattern position for selecting water temperature stall, the capacitive touch unit being used for sensing a touch action of human body and sending a touch signal;

A filter water supply pipeline provided with a filter, a liner 111 of a heater of the water heater 100 arranged at downstream of the filter;

A tap water supply pipeline;

A control unit electrically connected to the capacitive touch unit, the touch pattern position for selecting water temperature stall sending a touch signal when a touch action is sensed, and the control unit switching at once between preset five stalls according to a preset sequence;

Wherein one of the five stalls is a neutral stall which does not activate heating function, and the remaining four stalls are preset water temperature stalls. Heating temperature of four preset water temperature stalls being in order of 81° C. to 86° C., 85° C. to 90° C., 89° C. to 94° C. and 93° C. to 98° C.

The preset sequence being sequentially cycled in accordance with the five stalls of 81° C. to 86° C., 85° C. to 90° C., 89° C. to 94° C., 93° C. to 98° C. and the neutral stall.

In one of embodiment of the invention, it is preferred that the control device of water heater also comprises:

A hot water solenoid valve provided on hot water pipeline of the filter water supply pipeline and tap water supply pipeline;

A return solenoid valve provided on a return pipeline of the filter water supply pipeline and tap water supply pipeline, return pipeline communicating with the hot water pipeline, the return solenoid valve being a normally open type direct acting solenoid valve;

The control unit also electrically connected to the hot water solenoid valve and the return solenoid valve, the control unit controlling the hot water solenoid valve to supply hot water, and then, through the return solenoid valve (normally open type) to make hot water of the hot water pipeline go through the return pipeline flow back to the liner 111 of a heater of the water heater 100.

In one of embodiment of the invention, it is preferred that the control device of water heater also comprises:

A cold water solenoid valve arranged at a cold water pipeline of the water heater 100, the cold water pipeline connecting in parallel with the hot water pipeline, when the cold water solenoid valve is opened to supply cold water, closing the return solenoid valve, the cold water solenoid valve also electrically connected to the control unit.

In one of embodiment of the invention, as shown in FIG. 1, FIG. 2, FIG. 3, FIG. 4 and FIG. 5, a control device of water heater is provided on a water heater 100, comprising a circuit board 200, a circuit board 300, a liner 111, a heat generating pipe 114.

The water heater 100 comprises a power cord 102 connected to a power plug 101 adapted to corresponding plug according to be sold to different country. Power switch is a power switch of complete machine, and has waterproof soft cover with waterproof function. The water inlet interface 103 is a quick-connect interface, and the interface aperture is 6.3 mm. The water outlet interface is 105 is a quick-connect interface, and the interface aperture is 9.5 mm. the joint of the control line interface 104 is a 5 pin air connector. Top of shell of the water heater 100 is provided with a heat radiating hole 109. The 107 is a stall indicator light, which is an atomized plastic piece for uniformly transmitting light emitted from stall LED indicator light. The current stall indicator light is a white LED indicator light (color of the indicator light can be changed as required).

The circuit board 200 includes a relay 201 which controls power supply of the heat generating pipe, a rectifier bridge 207 for changing rectifying AC18V outputted from a transformer 112 into DC24V, a filter capacitor 208, a plug-in piece 202 for connecting the heat generating pipe, an AC power source and a transformer input terminal; a wiring port 203 for electrically connecting the power supply indicator light 108 as a power supply indicator for whole machine; a wiring port 204 for electrically connecting NTC temperature sensor 113; a wiring port 205 capable of electrically connecting the circuit board 300 using 5 pin cable, and a wiring port 206 for connecting AC18V power supply outputted from a transformer 112.

The circuit board 300 includes four stall indicator lights comprising a first stall indicator light 304, a second stall indicator light 305, a third stall indicator light 306, a fourth stall indicator light 307; a wiring port 308 for electrically connecting the return solenoid valve 301, a rotary switch 309 for is setting delay time, a touch spring 310 for electrically connecting the decorative ring 106, the decorative ring 106 being a plastic piece with an conductive coating on its surface. As a touch input panel, including a wiring port 311 for electrically connecting a control line interface 104, a connection line interface 312 for electrically connecting the hot water solenoid valve 302, a wiring port 314 for electrically connecting the cold water solenoid valve 303, a wiring port 315 for electrically docking the wiring port 205 of the control board 200.

The liner 111 includes a heat generating pipe 114 with heat generating power of 2000 W. An NTC temperature sensor 113 is attached to the outer wall of the liner for detecting real-time temperature change of water heating by the heat generating pipe of the liner.

Working principle of circuit:

As shown in FIG. 8, AC JACK1 AC is input interface of AC power supply, K1 is a power switch, T1 is a frequency transformer, and CN4A is an output interface of transformer.

As shown in FIG. 9, CN4B is a power interface for connecting AC18V power supply outputted from transformer, BD1 is a rectifier bridge, and C1 is a filter capacitor.

As shown in FIG. 10, K2 is a relay, Q1 is a relay-driven transistor, LED1 is an indicator light for indicating pull-in action of the relay, D1 is an is absorption diode, and the heat generating pipe is a 2000 W heat generating pipe.

As shown in FIG. 11, A board and B board are electrically connected by 5 pin ribbon wire.

As shown in FIG. 12, U2 is a 12V regulator chip for voltage stabilization of DC24 into 12V, and U1 is 5V regulator chip used to stabilize 12V into 5V to supply power for control chip of whole microcontroller. Q2 and Q3 constitute power supply control circuit of whole machine control system. When EN-B port is low level, Q2 will be turned on. Then the whole machine control system will have electricity for normal operation. Main purpose of this circuit is only connecting external faucet control circuit when water device control system will have to work to prevent the water device separate electricity work and hot water overflow to cause personnel burns.

As shown in FIG. 13, U4 is a touch chip, CN15 is a spring for connecting a touch panel, and LED10 is a touch signal indicator light. When a touch signal is sent, LED10 will be synchronized lightening.

As shown in FIG. 14, U3 is a microcontroller control chip for heating and temperature control of the entire water heater. R22, R23 and C10 constitute a reset circuit of the microcontroller. U6 is a memory chip for memorizing setting stall before power failure, and automatic jumping set stall next time power supply. LED3 is a first stall indicator light. LED4 is a second stall is indicator light. LED5 is a third stall indicator light. LED6 is a fourth stall indicator light. RT1 is a NTC thermistor for detecting real time temperature of water temperature of the water heater. SW2 is a manual reset switch, clicking to reset to initial power-up state. 17th Touch Key of single-chip U3 is connected with touch output signal of touch chip (U4 in FIG. 11), the first pin of U3 microcontroller through a resistor R28 connected to base resistor R1 of the relay drive transistor (Q3 in FIG. 8).

As shown in FIG. 15, U5 is a primary microcontroller. SW1 is a rotary switch used to set delay time of the cold water solenoid valve. Open C is connected to the cold water solenoid valve drive, Open H is connected to the hot water solenoid valve drive, Close G is connected to the return solenoid valve drive. Serial1 and Serial2 is connected to external tap control panel for communication control.

As shown in FIGS. 16, D2 and D3 are power supply isolation diodes. C8 is a filter capacitor. Q4 is a cold water solenoid valve drive transistor. LED7 is an action indicator light of the cold water solenoid valve, D4 is a solenoid valve absorption diode. D5 is a hot water solenoid valve drive transistor. D6 is a return solenoid valve drive transistor. CN11 is connected with the cold water solenoid valve. CN12 is connected with the hot water solenoid valve. CN13 is connected with the return solenoid valve.

Number of modules and scale of processing described herein are intended to simplify description of the invention. The application, modification and variation of touch sensing circuit and temperature stall of the present invention will be apparent to those skilled in the art.

Although the embodiments of the present invention have been disclosed above, they are not limited to the applications previously mentioned in the specification and embodiments, and can be applied in various fields suitable for the present invention. For ordinary skilled person in the field, other various changed model, formula and parameter may be easily achieved without creative work according to instruction of the present invention, changed, modified and replaced embodiments without departing the general concept defined by the claims and their equivalent are still included in the present invention. The present invention is not limited to particular details and illustrations shown and described herein. 

What is claimed is:
 1. A control device of water heater, comprising: a touch pattern position for selecting water temperature stall, which is formed on the water heater; a capacitive touch unit including a touch sensing circuit provided in the water heater and corresponding to the touch pattern position for selecting water temperature stall, the capacitive touch unit being used for sensing a touch action of human body and sending a touch signal, and a control unit electrically connected to the capacitive touch unit, the touch pattern position for selecting water temperature stall sending a touch signal when a touch action is sensed, and the control unit switching at once between preset five stalls according to a preset sequence; wherein one of the five stalls is a neutral stall which does not activate heating function, and the remaining four stalls are preset water temperature stalls, each water temperature stall corresponding to a temperature range, and two adjacent water temperature stall having coincident temperature value range.
 2. The control device of water heater according to claim 1, being characterized in that: heating temperatures of four preset water temperature stalls are in order of 81° C. to 86° C., 85° C. to 90° C., 89° C. to 94° C. and 93° C. to 98° C.; and the preset sequence is sequentially cycled in accordance with the five stalls of 81° C. to 86° C., 85° C. to 90° C., 89° C. to 94° C., 93° C. to 98° C. and the neutral stall.
 3. The control device of water heater according to claim 1, being characterized in that: the touch action is set a preset time, when time of the touch action is not shorter than the preset time, the touch pattern position for selecting water temperature stall sensing the touch action and sending a touch signal; when time of the touch action is shorter than the preset time, the touch pattern position for selecting water temperature stall unable to sense the touch action.
 4. The control device of water heater according to claim 3, being characterized in that: the preset time is 500 ms.
 5. The control device of water heater according to claim 1, being characterized in that: the control device also comprises: a heat generating pipe provided in a liner of a heater of the water heater and electrically connected to the control device; a temperature detector disposed outside of the liner of the heater to detect water temperature of the liner, the temperature detector being electrically connected to the control device; the control device controlling power supplying or interruption of the heat generating pipe in accordance with water temperature detected and temperature currently-executed of water temperature stall.
 6. The control device of water heater according to claim 1, being characterized in that: the control device also comprises: four stall indicator lights which are arranged at the water heater, are located beside the touch pattern position for selecting water temperature stall, and are electrically connected with the control device, each stall indicator light respectively corresponding to a water temperature stall, the four stall indicator lights corresponding to the neutral stall, when in the state of one of water temperature stall, the control device controlling stall indicator light corresponding to the water temperature stall turning on; when in the neutral stall, the four stall indicator lights being turned on at the same time.
 7. The control device of water heater according to claim 6, being characterized in that: when in a water temperature stall, stall indicator light corresponding to the water temperature stall twinkles in heating process; the stall indicator light being permanent bright when heating reaches the highest temperature of the water temperature stall; when in the neutral stall, the four stall indicator lights being all permanent bright; the stall indicator light being LED indicator light.
 8. The control device of water heater according to claim 1, being characterized in that: the control device also comprises: a power supply; a power supply indicator light provided in front of the water heater and electrically connected to the power supply and the control device.
 9. The control device of water heater according to claim 6, being characterized in that: the control device also comprises: a decorative ring disposed on the water heater, the decorative ring forming the touch pattern position for selecting water temperature stall.
 10. A control device of water heater, comprising: a touch pattern position for selecting water temperature stall, which is formed on the water heater; a capacitive touch unit including a touch sensing circuit provided in the water heater and corresponding to the touch pattern position for selecting water temperature stall, the capacitive touch unit being used for sensing a touch action of human body and sending a touch signal; a hot water solenoid valve provided on a hot water pipeline of the water heater; a return solenoid valve provided on a return pipeline of the water heater, the return pipeline communicating with the hot water pipeline, the return solenoid valve being a normally open type direct acting solenoid valve; a control unit electrically connected to the capacitive touch unit, the touch pattern position for selecting water temperature stall sending a touch signal when a touch action is sensed, and the control unit switching between preset five stalls at once according to a preset sequence; wherein one of the five stalls is a neutral stall which does not activate heating function, and the remaining four stalls are preset water temperature stalls, heating temperature of four preset water temperature stalls being in order of 81° C. to 86° C., 85° C. to 90° C., 89° C. to 94° C. and 93° C. to 98° C.; the preset sequence being sequentially cycled in accordance with the five stalls of 81° C. to 86° C., 85° C. to 90° C., 89° C. to 94° C., 93° C. to 98° C. and the neutral stall; the control unit also electrically connected to the hot water solenoid valve and the return solenoid valve, the control unit controlling the hot water solenoid valve to supply hot water, and then, through the return solenoid valve to make hot water of the hot water pipeline through the return pipeline flow back to the liner of a heater of the water heater.
 11. The control device of water heater according to claim 10, being characterized in that: the control device also comprises: a cold water solenoid valve arranged at a cold water pipeline of the water heater, the cold water pipeline connecting in parallel with the hot water pipeline, the cold water solenoid valve also electrically connected to the control unit.
 12. The control device of water heater according to claim 11, being characterized in that: the cold water solenoid valve and hot water solenoid valve are normally open type direct acting solenoid valves.
 13. The control device of water heater according to claim 11, being characterized in that: back-flow time of the return solenoid valve is 5 s.
 14. A control device of water heater, comprising: a touch pattern position for selecting water temperature stall, which is formed on the water heater; a capacitive touch unit including a touch sensing circuit provided in the water heater and corresponding to the touch pattern position for selecting water temperature stall, the capacitive touch unit being used for sensing a touch action of human body and sending a touch signal; a filter water supply pipeline provided with a filter, a liner of a heater of the water heater arranged at downstream of the filter; a tap water supply pipeline; a control unit electrically connected to the capacitive touch unit, the touch pattern position for selecting water temperature stall sending a touch signal when a touch action is sensed, and the control unit switching between preset five stalls at once according to a preset sequence; wherein one of the five stalls is a neutral stall which does not activate heating function, and the remaining four stalls are preset water temperature stalls, heating temperature of four preset water temperature stalls being in order of 81° C. to 86° C., 85° C. to 90° C., 89° C. to 94° C. and 93° C. to 98° C.; the preset sequence being sequentially cycled in accordance with the five stalls of 81° C. to 86° C., 85° C. to 90° C., 89° C. to 94° C., 93° C. to 98° C. and the neutral stall.
 15. The control device of water heater according to claim 14, being characterized in that: the control device also comprises: a hot water solenoid valve provided on a hot water pipeline of the filter water supply pipeline and the tap water supply pipeline; a return solenoid valve provided on a return pipeline of the filter water supply pipeline and the tap water supply pipeline, the return solenoid valve being a normally open type direct acting solenoid valve; the control unit also electrically connected to the hot water solenoid valve and the return solenoid valve, the control unit controlling the hot water solenoid valve to supply hot water, and then, the return solenoid valve to make hot water of the hot water pipeline go through the return pipeline flow back to the liner of a heater of the water heater.
 16. The control device of water heater according to claim 15, being characterized in that: the control device also comprises: a cold water solenoid valve arranged at a cold water pipeline of the water heater, the cold water pipeline connecting in parallel with the hot water pipeline, the cold water solenoid valve also electrically connected to the control unit, closing the return solenoid valve when cold water is supplied through the cold water solenoid valve. 